852412 ÷ 18 
The aim is to understand the frequency of 18 in 852412.

Moving on to step 1:
The number 18 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 18

Moving on to step 2:
18 goes into 85 4 times with a remainder of 13.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 13 after subtracting 72 from 85.
Take the next digit (2) from the dividend and append it to 13, then repeat: 132 / 18

Moving on to step 3:
132 divided by 18 is 7 with a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
Subtracting 126 from 132 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 18

Advancing to step 4:
18 goes into 64 3 times with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 473.0
If we subtract 54 from 64, we get 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 18

Going ahead to step 5:
101 divided by 18 is 5 with a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 4735.0
Deduct 90 from 101 and we're left with 11.
Grab the next digit (2) from the dividend, add it to 11, then carry on: 112 / 18

Moving on to step 6:
18 goes into 112 6 times with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 47356.0
Deduct 108 from 112 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
The number 18 fits into 40 2 times, leaving a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 47356.2
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
18 can be fit into 40 2 times, resulting in a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 47356.22
Deduct 36 from 40 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 47356.22 with a remaining 0.004.